in 2007 we became parents of identical twin girls, zoe and nina. we knew it was time to come home. so, in early 2008 we were fortunate enough to find a house that at the time suited our needs perfectly in noe valley, just a wonderful neighborhood that we love. but over the past 4-1/2 years that we have lived there, we've been thinking about how our needs are going to change as the girls get older. and we framed our discussion this way. will this house suit us for another 20 years or more? and will it continue to suit us if we decide to have another child? and we realized that as much as we love this house that our changing needs might cause us to outgrow it. with some modest changes it could be a comfortable cozy home for years to come. the specific examples i want to bring up are if we were to have another child, then we would have to put both twins in this bedroom back here so that we can have all the kids on the same floor as the master bedroom. but these -- this is a very small room, particularly for two children. and, so, we want to add 125 square feet to the second floor. sim